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The use of milk as a diluter for bull semen was reported by Thacker and Almquist (5) in 1951. They suggested that the non-return rate from its use in artificial insemination was equal .to, if not slightly better than, that from the use of yolk-citrate. Almquist and Thacker (1) report that the increases in six low-fertility bulls accounted for the major portion of the improvement obtained with milk plus antibiotics as compared to yolk-citrate plus antibiotics.
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Dreher et al. (1953) studied this question.
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